Main •
Adrian Dunbar as Alex Ridley, a retired detective inspector, now serving as a police consultant •
Bronagh Waugh as DI Carol Farman, team leader and Ridley's former protege • Terence Maynard as DCI Paul Goodwin, Farman's boss •
Georgie Glen as Wendy Newstone, police pathologist and chief forensics officer • George Bukhari as DC Darren Lakhan, a junior detective on Farman's team •
Julie Graham as Annie Marling, owner of the jazz club and a close friend of Ridley •
Bhavna Limbachia as Geri Farman, Carol's wife
Supporting •
Aidan McArdle as Michael Flannery, a convicted criminal who murdered Ridley's wife and daughter •
Jacquetta May as Kate Ridley, Ridley's wife, who died in the house fire (in flashbacks) • Kitty Watson as Ella Ridley, Ridley's daughter, who also died in the house fire (in flashbacks) • Tareq Al-Jeddal as Jack Farman, Carol and Geri's teenaged son ==Episodes==